<!-- This SVG file uses itself as an image.  Currently, we don't paint
     recursively-referenced images beyond the first level.  When this testcase
     is viewed directly, it gets treated as a document (not an image), so its
     <image> element is painted.  However, the <image>'s own *internal* <image>
     element does *not* get painted.  So we end up painting two blue circles:
     one for the <circle> and one for the <image>'s <circle> (and no more). -->
<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     width="100" height="100">
  <circle cx="10" cy="10" r="10" fill="blue"/>
  <image x="20" y="20" width="100" height="100"
         xlink:href="#foo"/>
  <!-- When used as a URL, #foo evaluates to ${my_url}#foo, which (when treated
       as an image URL) just turns into ${my_url}. -->
</svg>
